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Träfflista för sökning "WFRF:(Pugh E) srt2:(1993-1994)"

Sökning: WFRF:(Pugh E) > (1993-1994)

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1.
  • Manev, E, et al. (författare)
  • Frother/collector interactions in thin froth films and flotation
  • 1993
  • Ingår i: Colloids and Surfaces A. - 0927-7757 .- 1873-4359. ; 70, s. 289-295
  • Tidskriftsartikel (refereegranskat)abstract
    • Thin aqueous equilibrium film studies and surface tension measurements on a mixed surfactant system consisting of polyethylene oxide (a model frother) and potassium ethyl xanthate (a model collector) enable the interaction between the two surfactants at the air/solution interface to be elucidated. For the film containing the non-ionic frother, the interface was charged and addition of low concentrations of xanthate acted as a common electrolyte and reduced the thickness of the film inducing rupture. However, at high xanthate collector concentrations, the negative charge xanthate was found to interact with the non-ionic and caused a buildup of negative charge at the air/solution. Higher frother concentrations were necessary to produce non-rupturing thin films upon increasing the xanthate concentration.
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2.
  • Waltermo, Å, et al. (författare)
  • Foam films and surface force studies of aqueous solutions of octyl-ß-glucoside
  • 1994
  • Ingår i: Journal of Dispersion Science and Technology. - 0193-2691 .- 1532-2351. ; 15, s. 273-296
  • Tidskriftsartikel (refereegranskat)abstract
    • The interactions at the air/liquid and the liquid/solid interface have been studied for octyl ß glucoside. With the thin film balance the thickness of the equilibrium liquid films is determined as a function of surfactant concentration, inert salt concentration and pH. At high surfactant concentration and/or at low. pH black films, about 4.6 nm thick, are formed. The stabilizing forces in the black films are related to the interactions within and between the layers. The forces acting between octyl-ß-glucoside surfactant layers adsorbed on hydrophobized mica were investigated with the interferometric type surface force apparatus. The forces measured between the sugar head-groups were similar to those acting between other small nonionic groups like dimethylamine oxide and monoglycerides. However, considerably more long-range repulsions are observed between surfactants with oligoethylene oxide head-groups.
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3.
  • Wang, Y, et al. (författare)
  • The influence of interparticle surface forces on the coagulation of weakly magnetic mineral ultrafines in a magnetic field
  • 1994
  • Ingår i: Colloids and Surfaces A. - 0927-7757 .- 1873-4359. ; 90, s. 117-133
  • Tidskriftsartikel (refereegranskat)abstract
    • In this paper, it is shown that the coagulation of dispersions of weakly magnetic mineral ultrfines (such as hematite and chromite) in an external magnetic field can be described theoretically by invoking interparticle forces. Essentially, coagulation occurs when the short-range London-van der Waals interactions and the long-range magnetic forces outweight the stabilizing electric double layer repulsion. From classical colloid chemistry theory, we have calculated the the various components of the potential energy for different-sized particles at a series of ionic strenghts and magnetic field intensities. Principles governing the stability of the suspensions of weakly magnetic oxide mineral ultrafines in a "wet magnetic separation process". Experimentally, the magnetic-field induced coagulation of ultrafines of natural hematite and chromite in aqueous suspensions at moderate ionic strenght was investigated using a laboratory -scale electromagnetic solenoid. The experimental results relate the coagulation process (as determined by magnetosdimentation analysis) to particle size, slurry pH and the external magnetic field. In the magnetic fields, maximum coagulation occured near the pH of the point of zero charge (pH PZC)of the minerals (where the electrostatic double layer repulsionwas reduced to a minimum) enabling the particles to enter the"primary minimum" energy sink. In contrast, in cases where the electrostatic repulsion was not supressed, the long-range magnetic forces enabled coagulation to occur in the "secondary minimum". This caused the formation of chains which appeared to be relatively stable at enhanced rates of setting. The experimental results could be interpreted from a theoretical analysis of the interparticle forces controlling the process.
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  • Resultat 1-3 av 3
Typ av publikation
tidskriftsartikel (3)
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refereegranskat (3)
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Pugh, RJ (2)
Manev, E (2)
Wang, Y. (1)
Claesson, P. (1)
Waltermo, Å (1)
Pugh, R (1)
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Forssberg, E. (1)
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Engelska (3)

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